52. How many four-letter "words" can be made from 6 letters "AEBWDP" if a. repetition of letters is allowed
b. repetition of letters is not allowed

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!

x = 12

y = 1

for the points!

look at the picture i have filled out a table for it. hope this .